System File Checker (SFC) is a Windows tool that checks system files for corruption and helps fix problems that may cause Windows to malfunction. To run it, follow these steps:
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Make sure you've installed the latest updates for Windows, and then restart your machine. To find out more, read Update Windows.
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In the search box on the taskbar, type command prompt, and right-click or press and hold Command Prompt from the list of results. Select Run as administrator, and then selectYes.
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Type DISM.exe /Online /Cleanup-image /Restorehealth (note the space before each "/"), and then press Enter.
Note:Â This step may take a few minutes to start and complete.
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After you see a message that says "The operation completed successfully," type sfc /scannow (note the space between "sfc" and "/") and press Enter.
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After you see a message that says, "Verification 100% complete," type exit and press Enter.
